thankyou for your reply :)

so i changed my code:

glEnable(GL_DEPTH_TEST);
while(true)
{
glPushMatrix();

glPushMatrix();

my purpose is to create a big semi-transparent cube box, and inside of it contains a non-transparent sphere.

here is my simplified code:

GLUquadricObj* object;
object = gluNewQuadric();...